本文详细介绍Ajax基础教程（5）- 5.7 实现高级JavaScript技术
代码清单5-3是一个很小的Web页面，展示了这3个对象的继承机制。这个页面只包含3个按钮，每个按钮创建一个类型的对象（Vehicle、SportsCar或CementTruck），并把对象传递到describe函数。describe函数负责显示各个对象的属性值，以及对象函数的返回值。注意，describe方法并不知道它描述的对象是Vehicle、SportsCar，还是CementTruck，它只是认为这个对象有适当的属性和函数，并由这个对象返回自己的值。
代码清单5-3 inheritanceViaPrototype.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>JavaScript Inheritance via Prototype</title>
<script type="text/javascript" src="inheritanceViaPrototype.js"></script>
<script type="text/javaScript">
function describe(vehicle) {
var description = "";
description = description + "Number of wheels: " + vehicle.wheelCount;
description = description + "
Curb Weight: " + vehicle.curbWeightInPounds;
description = description + "
Refueling Method: " + vehicle.refuel();
description = description + "
Main Tasks: " + vehicle.mainTasks();
alert(description);
}
function createVehicle() {
var vehicle = new Vehicle();
describe(vehicle);
}
function createSportsCar() {
var sportsCar = new SportsCar();
describe(sportsCar);
}
function createCementTruck() {
var cementTruck = new CementTruck();
describe(cementTruck);
}
</script>
</head>
<body>
<h1>Examples of JavaScript Inheritance via the Prototype Method</h1>
<br/><br/>
<button onclick="createVehicle();">Create an instance of Vehicle</button>
<br/><br/>
<button onclick="createSportsCar();">Create an instance of SportsCar</button>
<br/><br/>
<button onclick="createCementTruck();">Create an instance of CementTruck</button>
</body>
</html>
来源：CSDN 责编：豆豆技术应用
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